- Tax income sent to the Galactic Bank is doubled (60% instead of 30%). The tax income that stays in the base doesn't change (70%). Neither does the money from Government Centers.
- Double growth of natives in the base.
- Allows you to build N. Willow Class Survey Ships in that base.
- Allows you to build N. Everygreen Science Vessels in that base.
- If you have built either an Arerran Capital, Nawole Garden or Xelovi Hive in a base, you cannot build any of the other structures in the same base.